Separator and separation method

Abstract

A problem is to solve problems on removal of solids by a screen and on an installation space and pipe connection in a separator. A solution to the problem is as follows. A separator 1 , which is a device for separating solids contained in influent liquid, has a separation tank 2 ; a partition plate 5 partitioning an inside space of the separation tank 2 into an inflow chamber 3 and an outflow chamber 4 ; a screen 8 provided at the partition plate 5 ; a liquid inlet 6 formed at the inflow chamber 3 ; and a discharge outlet 7 formed at the outflow chamber 4 ; the inflow chamber 3 is provided with a guide unit 9, 10, 10 a for forming a vertical swirling flow in the inflow chamber 3 by reversing the influent liquid from the liquid inlet 6 ; the screen 8 is disposed along a side face of the swirling flow thus formed. This configuration permits the solids to be removed, without clogging the screen with the solids.

The invention claimed is: 
     
       1. A separator, which is a device for separating solids contained in influent liquid, said separator comprising:
 a separation tank; 
 a partition plate partitioning an inside space of the separation tank into an inflow chamber and an outflow chamber; 
 a screen connected to the partition plate; 
 a liquid inlet connected to the inflow chamber; 
 a discharge outlet connected to the outflow chamber; and 
 guides located in the inflow chamber that form a vertical swirling flow in the inflow chamber by reversing the influent liquid from the liquid inlet, and wherein the screen is disposed along a side face of the swirling flow thus formed, 
 wherein the separation tank is formed with a plane cross section of a rectangular shape having a longitudinal axis and a transverse axis, and 
 wherein the partition plate is disposed so as to be parallel to the longitudinal axis, wherein the liquid inlet at the inflow chamber is formed at one longitudinal end of the separation tank, and wherein the discharge outlet at the outflow chamber is formed at the other longitudinal end of the separation tank. 
 
     
     
       2. The separator according to  claim 1 , wherein the screen comprises two screens, and the screens are provided so that they are parallel to each other or so that a distance between them decreases with distance from the liquid inlet. 
     
     
       3. The separator according to  claim 1 , wherein the screen is composed of a wedge wire screen in which a plurality of wedge wires with a wedge-shaped cross section are arranged in a vertical direction, and a part of an inner surface of the inflow chamber is composed of heads of the respective wedge wires. 
     
     
       4. The separator according to  claim 3 , wherein axis lines extending from the heads of the respective wedge wires toward distal ends thereof are inclined toward a downstream side of the formed vertical swirling flow, and the axis lines are inclined in opposite directions to each other according to upper and lower flows of the vertical swirling flow. 
     
     
       5. The separator according to  claim 1 , wherein a solid discharge outlet is provided at a bottom of the inflow chamber. 
     
     
       6. The separator according to  claim 1 , wherein a drain outlet is provided at a bottom of the outflow chamber. 
     
     
       7. The separator according to  claim 1 , wherein the liquid inlet is formed at an upper portion of the inflow chamber, one guide of the guides is provided at a portion where the swirling flow ascends from a lower portion in the inflow chamber toward the liquid inlet, and a gap is provided between an end of the one guide and a peripheral wall on which the swirling flow ascends. 
     
     
       8. The separator according to  claim 1 , wherein an overflow section to establish communication between the inflow chamber and the outflow chamber is provided at an upper portion of the partition plate, and the discharge outlet is provided with a weir to prevent oil or floating solids from flowing thereinto.